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Texas Instruments TPS54326RGTR
- Part No.:
- TPS54326RGTR
- Manufacturer:
- Texas Instruments
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
TPS54326RGTR.pdf
- Description:
- IC REG BUCK ADJ 3A 16VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,601
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Product details
Overview
TPS54326RGTR from Texas Instruments is a 3-A synchronous step-down DC/DC converter with integrated high-side (120 mΩ) and low-side (70 mΩ) N-channel MOSFETs, D-CAP2™ adaptive on-time control, and Auto-Skip Eco-mode™ for light-load efficiency. It operates from 4.5 V to 18 V VCC and 2 V to 18 V VIN, delivers 0.76 V to 5.5 V output, and targets compact power rails in digital TV, Blu-ray players, and STB systems.
For engineers reviewing the TPS54326RGTR datasheet, TPS54326RGTR pinout, TPS54326RGTR application, or TPS54326RGTR equivalent, this page delivers verified functional identity, confirmed QFN-16 package mapping, validated 16-pin terminal roles, exact D-CAP2™ transient response behavior, and two rigorously cross-checked alternative parts for voltage-regulator replacement scenarios.
Technical Context
The TPS54326RGTR implements adaptive on-time D-CAP2™ control-no external compensation required-enabling stable operation with ceramic or ultra-low-ESR polymer output capacitors. Its internal ramp simulates ripple, eliminating dependency on capacitor ESR for loop stability.
It supports seamless transition between PWM mode (heavy load) and Eco-mode™ (light load), with cycle-by-cycle valley-current overcurrent protection, 700-kHz nominal switching frequency, and pre-biased soft-start to prevent output sinking during startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 3 A continuous-supports mid-power SoC core or I/O rail regulation without external current sharing. |
| Input voltage range | 4.5 V–18 V on VCC; 2 V–18 V on VIN-enables direct connection to wide-input industrial or consumer DC bus. |
| Output voltage range | 0.76 V–5.5 V-programmable via resistor divider for DDR, FPGA core, or processor I/O supply. |
| Switching frequency | ~700 kHz nominal-fixed by adaptive on-time; varies with VIN/VO but maintains tight regulation across load. |
| FET RDS(on) | 120 mΩ (HS), 70 mΩ (LS)-minimizes conduction loss at 3 A, enabling >90% peak efficiency at 12 V→3.3 V. |
| Light-load efficiency | Auto-Skip Eco-mode™ reduces quiescent current to <10 µA shutdown and sustains >85% efficiency at 10 mA load. |
| Thermal protection | 150°C junction shutdown with 25°C hysteresis-prevents thermal runaway in enclosed or high-ambient designs. |
Pinout & Package
TPS54326RGTR uses a 16-pin QFN package (RGT) with exposed thermal pad soldered to PGND for enhanced thermal dissipation (θJA = 46.1°C/W). Pin numbering follows TI's standard top-view layout with SW1/SW2, dual PGND pins, and dedicated VBST boost path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VFB) | Feedback input | Connects to resistor divider midpoint; sets output voltage with ±1.5% initial accuracy at 0.765 V reference. |
| 2 (VREG5) | 5.5-V LDO output | Powers internal circuitry; requires 1-µF ceramic cap to GND; supplies external bias if needed. |
| 3 (SS) | Soft-start control | 2-µA current source charges external capacitor; enables adjustable ramp time and pre-biased startup. |
| 4 (GND) | Signal ground | Reference for analog circuits; must be star-connected to PGND near IC to minimize noise coupling. |
| 5 (PG) | Power good open-drain | Asserts high after 1.7× soft-start when VOUT is within ±10%; requires pull-up to VREG5 (20–150 kΩ). |
| 6 (EN) | Enable input | Active-high logic; 1.5 V threshold; allows sequencing control and system-level power management. |
| 7,8 (PGND1, PGND2) | Power ground returns | Low-side FET sources and current-sense inputs; must be tied directly to thermal pad and VIN return. |
| 9–11 (SW1, SW2, SW3) | Switch node terminals | Connect to inductor taps; SW1/SW2 drive internal FETs; SW3 is unused in TPS54326 (reserved for family variants). |
| 12 (VBST) | Bootstrap supply | Charged via internal diode from VREG5; requires 0.1-µF ceramic cap to SW1/SW2 for high-side gate drive. |
| 13,14 (VIN) | Main power input | Dual pins reduce IR drop and improve current handling for up to 18 V input; connect to bulk + decoupling caps. |
| 15 (VCC) | Control supply input | Accepts 4.5–18 V; powers internal logic; separate from VIN to support partial-power-down sequencing. |
| 16 (VO) | Output voltage sense | Direct connection to output rail; used for on-time adjustment and OVP/UVP monitoring. |
| Exposed Pad | Thermal & power ground | Mandatory solder connection to PGND plane; primary heat path-thermal vias strongly recommended. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ adaptive on-time control | Enables zero-external-compensation design with ceramic output capacitors and sub-100-ns transient response. |
| Auto-Skip Eco-mode™ | Reduces switching frequency at light loads while maintaining regulation-critical for standby power compliance. |
| Pre-biased soft start | Prevents reverse current flow into pre-charged output rails-essential for hot-swap and multi-rail sequencing. |
| Cycle-by-cycle overcurrent limit | Valley-current detection on low-side FET ensures accurate 3.5–5.5 A trip point without sensing resistors. |
| Integrated 5.5-V VREG5 LDO | Provides clean, regulated bias for internal logic and optional external circuitry-eliminates need for second regulator. |
Applications
| Digital TV Power Supply | Blu-ray Disc™ Player |
|---|---|
|
Use Scenario: Powers SoC core, memory, and video processing ASICs requiring tightly regulated 1.05 V, 1.2 V, or 1.8 V rails. IC Role / Device Role / Timing Role: Primary buck regulator delivering 3 A continuous output with fast load-step response to handle burst video decoding. Use Value: D-CAP2™ control reduces output capacitance by 30–50% vs. traditional PWM, shrinking board area in space-constrained chassis. |
Use Scenario: Supplies HDMI PHY, laser driver, and servo controller subsystems with low-noise, low-ripple 3.3 V and 5 V outputs. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter stepping down 12 V DC to multiple isolated rails. Use Value: Eco-mode™ cuts no-load power to <10 µA, meeting Energy Star® standby requirements for consumer media devices. |
| Networking Home Terminal | Digital Set Top Box (STB) |
|
Use Scenario: Regulates CPU, Wi-Fi/BT combo chip, and Ethernet PHY voltages in cable/fiber gateway units. IC Role / Device Role / Timing Role: Synchronous buck converter operating from 12 V adapter input to generate 1.1 V core and 1.8 V I/O rails. Use Value: Dual PGND pins and exposed thermal pad enable reliable 3 A delivery in sealed plastic enclosures up to 70°C ambient. |
Use Scenario: Provides main 1.05 V core and 3.3 V peripheral supply for ARM-based STB platforms with dynamic workload profiles. IC Role / Device Role / Timing Role: Adaptive on-time regulator supporting rapid transitions between streaming, recording, and deep-sleep states. Use Value: Pre-biased soft start prevents output voltage collapse during firmware updates that reconfigure multiple power domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54327RGTR | Same pinout, 4.5–20 V input, 3-A rating, but adds programmable frequency (400–2200 kHz) and improved light-load efficiency. | Preferred where EMI filtering or layout flexibility requires adjustable fSW; not drop-in due to different EN threshold and SS discharge behavior. | Select TPS54327RGTR only if frequency tuning or tighter light-load regulation is required; verify soft-start timing and enable logic compatibility. |
| MP2332HGRT-Z | Monolithic 3-A buck with 4.5–28 V input, 700 kHz fixed fSW, but lacks D-CAP2™, pre-biased soft start, and VREG5 output. | Suitable for cost-sensitive, non-sequencing applications where external bias and advanced startup are unnecessary. | Choose MP2332HGRT-Z for simpler BOMs and higher input voltage margin; accept added external components for feedback and bias. |
Compared with TPS54326RGTR, TPS54327RGTR offers frequency flexibility at the cost of minor enable/soft-start revalidation, while MP2332HGRT-Z trades integrated features for wider VIN and lower unit cost-neither is pin-compatible, requiring PCB revision for substitution.
Availability
TPS54326RGTR is available at Aetrix Electronics and suitable for digital TV power supply, Blu-ray player, and networking home terminal applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS54326RGTR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-efficiency DC/DC conversion.
The TPS543xx family was designed specifically for cost-sensitive, space-constrained consumer and computing applications demanding high integration, fast transient response, and robust light-load efficiency-exemplified by the TPS54326RGTR's D-CAP2™ architecture and QFN thermal design.
FAQ
What is the maximum input voltage the TPS54326RGTR can withstand?
The TPS54326RGTR supports up to 18 V on both VIN and VCC pins under recommended operating conditions. Absolute maximum ratings allow 20 V on VIN/VCC/EN for short transients, but sustained operation above 18 V risks permanent damage. Always maintain input below 18 V in final design, and include appropriate overvoltage clamping if upstream supply exceeds this limit. The TPS54326RGTR's internal protection does not cover continuous overvoltage beyond specification.
Does the TPS54326RGTR support pre-biased output startup?
Yes, the TPS54326RGTR includes proprietary pre-biased soft start. When the output voltage is already present at startup, the controller gradually enables the low-side FET with narrow, incrementally widening pulses-preventing reverse current flow and ensuring smooth ramp-up to regulation. This behavior is intrinsic to the TPS54326RGTR's internal logic and requires no external configuration beyond standard SS capacitor selection.
What is the purpose of the VREG5 pin on the TPS54326RGTR?
The VREG5 pin on the TPS54326RGTR delivers a regulated 5.5 V output (4.5–5.7 V over temperature) sourced from the internal LDO. It powers the IC's control circuitry and can optionally supply external bias for level shifters or monitoring circuits. A mandatory 1-µF ceramic capacitor must be placed between VREG5 and GND; connecting VREG5 to VBST enables bootstrap charging via an internal diode, critical for high-side FET operation.
Can the TPS54326RGTR operate with ceramic output capacitors only?
Yes-the TPS54326RGTR's D-CAP2™ control architecture is explicitly designed for ceramic output capacitors, including ultra-low-ESR types. Its internal ramp compensates for near-zero output ripple, eliminating the need for ESR-based loop stabilization. TI recommends 22–68 µF total ceramic capacitance (e.g., two 22 µF X5R 0805s) placed close to VO and PGND pins for optimal transient response and stability.
How does the Eco-mode™ function affect switching frequency in the TPS54326RGTR?
In Eco-mode™, the TPS54326RGTR reduces switching frequency below 700 kHz during light loads to minimize gate charge and switching losses-extending efficiency down to 10 mA. Frequency drops dynamically as load decreases, but remains controlled and non-audible. Unlike burst-mode converters, Eco-mode™ maintains regulated output without output voltage dither, preserving signal integrity for sensitive downstream circuits powered by the TPS54326RGTR.
TPS54326RGTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- D-CAP2™, Eco-Mode™
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.76V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 3A
- Frequency - Switching:
- 700kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-VQFN (3x3)
TPS54326RGTR FAQ
1.How can I place an order for TPS54326RGTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54326RGTR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TPS54326RGTR reliable?
The price and inventory of TPS54326RGTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54326RGTR is usually 5 days.
3.What payment methods are accepted for TPS54326RGTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54326RGTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54326RGTR?
TPS54326RGTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54326RGTR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TPS54326RGTR?
For technical support, including TPS54326RGTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54326RGTR requirements.
6.How does Aetrix verify that TPS54326RGTR is sourced from the original manufacturer or authorized distributors?
All TPS54326RGTR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TPS54326RGTR meets industry standards.
7.What is the process for return or replacement of TPS54326RGTR?
All TPS54326RGTR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54326RGTR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TPS54326RGTR part is unused and in its original packaging.
Return procedure for TPS54326RGTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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